Hi carriekartman! We're glad you are here in the forums!
Increasing symptoms does not necessarily mean that your tumor has grown any. I went from 100% hearing while in watch and wait status to 12% hearing in one month, and when they did my six month MRI, my acoustic neuroma has not grown any at all! It was still the size it was when I had 100% hearing. So, do not jump to the conclusion that your tumor has grown. It may have or it may not have. Worsening symptoms is not always an indicator that your acoustic neuroma is growing larger.
And, if someone told you that "these tumors grow slowly," that is not entirely accurate either. Most acoustic neuromas grow slowly, but some do grow quickly. The norm is that they grow slowly, but there are exceptions to the general rule. The MRI is the only way to know how quickly your tumor is growing.
And the size of the tumor is not indicative of how bad your symptoms will be. I have a very tiny acoustic neuroma, and I lost almost all of my hearing in the AN ear. I had terrible balance issues where I needed a cane and fell frequently. I have continual tinnitus. But I know of others who had a very large acoustic neuroma, yet maintained their hearing 100%, have no tinnitus, and do not have any balance issues. They had to have surgery because their tumors were so large. Yet, they have not suffered with the issues I experienced.
All this tells me that you really cannot know that your tumor is growing because your symptoms are getting worse.
I wish you all the best on your journey, carriekartman!
Don